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Old 13th March 2012, 05:41 AM   #81
jrobson is offline jrobson  South Africa
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Yeah, the first batch I was able to measure the pins and noticed the tube was shorted, by then the board was a bit "worn out" from messing around a lot trying to find the problem, second batch it all seemed fine on the pins but when I put it together it blew a mosfet instantly, it could be that I broke them installing, I don't like the design overall because it appears to be quite frail, then went with my known working but not as suitable 900v mosfets and the CCS's blew, then decided to get new tubes again, new CCS's still on the 900v mosfets and worked no problem. I'll look into going to the recommended mosfets again later, I also need to get some better trim pots, the ones I have make it very tricky to set the bias, not sure if it's normal?

Certainly thanks to you that I got it working again, was quite interesting, ever seen a 5842 at 450v? It's like a beautiful red flashlight

Try 6C45Pi if you don't mind messing with the 5842 pinout, it's the same tube with different pins afaik, I think still made too. There is a guy on here who modified the design significantly and you can use his schematic and go with 6SN7's which is still made as well.
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Old 13th March 2012, 05:49 AM   #82
jrobson is offline jrobson  South Africa
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Oh, haha it sounds good, but it has a lot of hum now that it's assembled so I'll play around see if I can get it out.
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Old 13th March 2012, 12:52 PM   #83
jrobson is offline jrobson  South Africa
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Will there be any problems with 2A filament 300B tubes? I have U1 and D1 on a very large heatsink.
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Old 16th March 2012, 09:53 PM   #84
rknize is offline rknize  United States
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Should be fine. The regulator IC has thermal protection and will shut down if it overheats.
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Old 24th March 2012, 10:06 PM   #85
jrobson is offline jrobson  South Africa
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After about 10 - 15 hours or so this happened to me:Tubelab Simple SE - fuse blowing

One diode measures 99/94(depending which way around) and gets there quickly when I set it on the diode test, the other one gives a 821 one way and nothing the other...

I don't know if the tube sparked, I didn't see, music just went dead, saw the fuse was blown then decided that before I replace it to neaten up the wiring, so I powered it up with a new fuse and no tubes, kept on blowing fuses, R5 got quite hot at one stage so I thought must be the FRED diodes.

Solution new diodes and a new rectifier tube or is there something else to look into?

Last edited by jrobson; 24th March 2012 at 10:12 PM.
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Old 24th March 2012, 11:00 PM   #86
jrobson is offline jrobson  South Africa
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Another problem, figured I'll do the checkout again since I put new wires in, problem is with the output filament supply, 8.9v instead of 5...
I am using this: http://www.vishay.com/docs/94328/94328.pdf and this http://www.sharpsme.com/webfm_send/611

Measuring Pin1:8.9v, Pin2:8.9v, Pin3:ground, Pin4:2.27v, Pin5:8.9v

Any ideas?
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Old 24th March 2012, 11:53 PM   #87
jrobson is offline jrobson  South Africa
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How about this?
https://secure.cedist.com/scripts/fo...P?item=T-SSR01
But I don't want a stand-by switch, is there an automated delay solution?
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Old 25th March 2012, 12:37 AM   #88
jrobson is offline jrobson  South Africa
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Quote:
Originally Posted by jrobson View Post
Another problem, figured I'll do the checkout again since I put new wires in, problem is with the output filament supply, 8.9v instead of 5...
I am using this: http://www.vishay.com/docs/94328/94328.pdf and this http://www.sharpsme.com/webfm_send/611

Measuring Pin1:8.9v, Pin2:8.9v, Pin3:ground, Pin4:2.27v, Pin5:8.9v

Any ideas?
Ignore this stupid post, I suppose if I isolated the components when I mounted them on the large heatsink I wouldn't have seen this problem.
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Old 25th March 2012, 12:37 AM   #89
jrobson is offline jrobson  South Africa
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Quote:
Originally Posted by jrobson View Post
How about this?
https://secure.cedist.com/scripts/fo...P?item=T-SSR01
But I don't want a stand-by switch, is there an automated delay solution?
Found a soft start, bought a solid state rectifier and the soft start... Will report back if it all works ok.
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